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'LOGO Challenge - Blob' printed from http://nrich.maths.org/
Think carefully about the procedure below.
This procedure looks at the technique called recursion and can be
used to build up a particularly pleasing catalogue of patterns that
Investigate this intriguing procedure, try to formulate some ideas
about what is happening and test any conjectures that arise.
TO BLOB :A :C
FD 5 RT :A
BLOB :A + :C :C
You will have to tell LOGO to "HALT" at some point otherwise this
will go on forever - why?
Try: BLOB 3 9 / BLOB 2 8 and go from there.
BLOB 1 10 and BLOB 11 18 are reproduced here for you...